/*
 * @ socket.io库文件
 * @ xuanfeng
 * @ 2013-02-05
 * 
 */

define(function(require, exports, module){


  /*! Socket.IO.js build:0.8.4, development. Copyright(c) 2011 LearnBoost <dev@learnboost.com> MIT Licensed */

  /**
   * socket.io
   * Copyright(c) 2011 LearnBoost <dev@learnboost.com>
   * MIT Licensed
   */

  (function (exportss) {

    /**
     * IO namespace.
     *
     * @namespace
     */

    var io = exportss;

    /**
     * Socket.IO version
     *
     * @api public
     */

    io.version = '0.8.4';

    /**
     * Protocol implemented.
     *
     * @api public
     */

    io.protocol = 1;

    /**
     * Available transports, these will be populated with the available transports
     *
     * @api public
     */

    io.transports = [];

    /**
     * Keep track of jsonp callbacks.
     *
     * @api private
     */

    io.j = [];

    /**
     * Keep track of our io.Sockets
     *
     * @api private
     */
    io.sockets = {};


    /**
     * Manages connections to hosts.
     *
     * @param {String} uri
     * @Param {Boolean} force creation of new socket (defaults to false)
     * @api public
     */

    io.connect = function (host, details) {
      var uri = io.util.parseUri(host)
        , uuri
        , socket;

      if ('undefined' != typeof document) {
        uri.protocol = uri.protocol || document.location.protocol.slice(0, -1);
        uri.host = uri.host || document.domain;
        uri.port = uri.port || document.location.port;
      }

      uuri = io.util.uniqueUri(uri);

      var options = {
          host: uri.host
        , secure: 'https' == uri.protocol
        , port: uri.port || ('https' == uri.protocol ? 443 : 80)
        , query: uri.query || ''
      };

      io.util.merge(options, details);

      if (options['force new connection'] || !io.sockets[uuri]) {
        socket = new io.Socket(options);
      }

      if (!options['force new connection'] && socket) {
        io.sockets[uuri] = socket;
      }

      socket = socket || io.sockets[uuri];

      // if path is different from '' or /
      return socket.of(uri.path.length > 1 ? uri.path : '');
    };

  })('object' === typeof modules ? modules.exportss : (window.io = {}));

  /**
   * socket.io
   * Copyright(c) 2011 LearnBoost <dev@learnboost.com>
   * MIT Licensed
   */

  (function (exportss, global) {

    /**
     * Utilities namespace.
     *
     * @namespace
     */

    var util = exportss.util = {};

    /**
     * Parses an URI
     *
     * @author Steven Levithan <stevenlevithan.com> (MIT license)
     * @api public
     */

    var re = /^(?:(?![^:@]+:[^:@\/]*@)([^:\/?#.]+):)?(?:\/\/)?((?:(([^:@]*)(?::([^:@]*))?)?@)?([^:\/?#]*)(?::(\d*))?)(((\/(?:[^?#](?![^?#\/]*\.[^?#\/.]+(?:[?#]|$)))*\/?)?([^?#\/]*))(?:\?([^#]*))?(?:#(.*))?)/;

    var parts = ['source', 'protocol', 'authority', 'userInfo', 'user', 'password',
                 'host', 'port', 'relative', 'path', 'directory', 'file', 'query',
                 'anchor'];

    util.parseUri = function (str) {
      var m = re.exec(str || '')
        , uri = {}
        , i = 14;

      while (i--) {
        uri[parts[i]] = m[i] || '';
      }

      return uri;
    };

    /**
     * Produces a unique url that identifies a Socket.IO connection.
     *
     * @param {Object} uri
     * @api public
     */

    util.uniqueUri = function (uri) {
      var protocol = uri.protocol
        , host = uri.host
        , port = uri.port;

      if ('document' in global) {
        host = host || document.domain;
        port = port || (protocol == 'https'
          && document.location.protocol !== 'https:' ? 443 : document.location.port);
      } else {
        host = host || 'localhost';

        if (!port && protocol == 'https') {
          port = 443;
        }
      }

      return (protocol || 'http') + '://' + host + ':' + (port || 80);
    };

    /**
     * Mergest 2 query strings in to once unique query string
     *
     * @param {String} base
     * @param {String} addition
     * @api public
     */

    util.query = function (base, addition) {
      var query = util.chunkQuery(base || '')
        , components = [];

      util.merge(query, util.chunkQuery(addition || ''));
      for (var part in query) {
        if (query.hasOwnProperty(part)) {
          components.push(part + '=' + query[part]);
        }
      }

      return components.length ? '?' + components.join('&') : '';
    };

    /**
     * Transforms a querystring in to an object
     *
     * @param {String} qs
     * @api public
     */

    util.chunkQuery = function (qs) {
      var query = {}
        , params = qs.split('&')
        , i = 0
        , l = params.length
        , kv;

      for (; i < l; ++i) {
        kv = params[i].split('=');
        if (kv[0]) {
          query[kv[0]] = decodeURIComponent(kv[1]);
        }
      }

      return query;
    };

    /**
     * Executes the given function when the page is loaded.
     *
     *     io.util.load(function () { console.log('page loaded'); });
     *
     * @param {Function} fn
     * @api public
     */

    var pageLoaded = false;

    util.load = function (fn) {
      if ('document' in global && document.readyState === 'complete' || pageLoaded) {
        return fn();
      }

      util.on(global, 'load', fn, false);
    };

    /**
     * Adds an event.
     *
     * @api private
     */

    util.on = function (element, event, fn, capture) {
      if (element.attachEvent) {
        element.attachEvent('on' + event, fn);
      } else if (element.addEventListener) {
        element.addEventListener(event, fn, capture);
      }
    };

    /**
     * Generates the correct `XMLHttpRequest` for regular and cross domain requests.
     *
     * @param {Boolean} [xdomain] Create a request that can be used cross domain.
     * @returns {XMLHttpRequest|false} If we can create a XMLHttpRequest.
     * @api private
     */

    util.request = function (xdomain) {

      if ('undefined' != typeof window) {
        if (xdomain && window.XDomainRequest) {
          return new XDomainRequest();
        }

        if (window.XMLHttpRequest && (!xdomain || util.ua.hasCORS)) {
          return new XMLHttpRequest();
        }

        if (!xdomain) {
          try {
            return new window.ActiveXObject('Microsoft.XMLHTTP');
          } catch(e) { }
        }
      }

      return null;
    };

    /**
     * XHR based transport constructor.
     *
     * @constructor
     * @api public
     */

    /**
     * Change the internal pageLoaded value.
     */

    if ('undefined' != typeof window) {
      util.load(function () {
        pageLoaded = true;
      });
    }

    /**
     * Defers a function to ensure a spinner is not displayed by the browser
     *
     * @param {Function} fn
     * @api public
     */

    util.defer = function (fn) {
      if (!util.ua.webkit) {
        return fn();
      }

      util.load(function () {
        setTimeout(fn, 100);
      });
    };

    /**
     * Merges two objects.
     *
     * @api public
     */
    
    util.merge = function merge (target, additional, deep, lastseen) {
      var seen = lastseen || []
        , depth = typeof deep == 'undefined' ? 2 : deep
        , prop;

      for (prop in additional) {
        if (additional.hasOwnProperty(prop) && util.indexOf(seen, prop) < 0) {
          if (typeof target[prop] !== 'object' || !depth) {
            target[prop] = additional[prop];
            seen.push(additional[prop]);
          } else {
            util.merge(target[prop], additional[prop], depth - 1, seen);
          }
        }
      }

      return target;
    };

    /**
     * Merges prototypes from objects
     *
     * @api public
     */
    
    util.mixin = function (ctor, ctor2) {
      util.merge(ctor.prototype, ctor2.prototype);
    };

    /**
     * Shortcut for prototypical and static inheritance.
     *
     * @api private
     */

    util.inherit = function (ctor, ctor2) {
      function f() {};
      f.prototype = ctor2.prototype;
      ctor.prototype = new f;
    };

    /**
     * Checks if the given object is an Array.
     *
     *     io.util.isArray([]); // true
     *     io.util.isArray({}); // false
     *
     * @param Object obj
     * @api public
     */

    util.isArray = Array.isArray || function (obj) {
      return Object.prototype.toString.call(obj) === '[object Array]';
    };

    /**
     * Intersects values of two arrays into a third
     *
     * @api public
     */

    util.intersect = function (arr, arr2) {
      var ret = []
        , longest = arr.length > arr2.length ? arr : arr2
        , shortest = arr.length > arr2.length ? arr2 : arr;

      for (var i = 0, l = shortest.length; i < l; i++) {
        if (~util.indexOf(longest, shortest[i]))
          ret.push(shortest[i]);
      }

      return ret;
    }

    /**
     * Array indexOf compatibility.
     *
     * @see bit.ly/a5Dxa2
     * @api public
     */

    util.indexOf = function (arr, o, i) {
      if (Array.prototype.indexOf) {
        return Array.prototype.indexOf.call(arr, o, i);
      }

      for (var j = arr.length, i = i < 0 ? i + j < 0 ? 0 : i + j : i || 0; 
           i < j && arr[i] !== o; i++);

      return j <= i ? -1 : i;
    };

    /**
     * Converts enumerables to array.
     *
     * @api public
     */

    util.toArray = function (enu) {
      var arr = [];

      for (var i = 0, l = enu.length; i < l; i++)
        arr.push(enu[i]);

      return arr;
    };

    /**
     * UA / engines detection namespace.
     *
     * @namespace
     */

    util.ua = {};

    /**
     * Whether the UA supports CORS for XHR.
     *
     * @api public
     */

    util.ua.hasCORS = 'undefined' != typeof window && window.XMLHttpRequest &&
    (function () {
      try {
        var a = new XMLHttpRequest();
      } catch (e) {
        return false;
      }

      return a.withCredentials != undefined;
    })();

    /**
     * Detect webkit.
     *
     * @api public
     */

    util.ua.webkit = 'undefined' != typeof navigator
      && /webkit/i.test(navigator.userAgent);

  })(
      'undefined' != typeof window ? io : modules.exportss
    , this
  );

  /**
   * socket.io
   * Copyright(c) 2011 LearnBoost <dev@learnboost.com>
   * MIT Licensed
   */

  (function (exportss, io) {

    /**
     * Expose constructor.
     */

    exportss.EventEmitter = EventEmitter;

    /**
     * Event emitter constructor.
     *
     * @api public.
     */

    function EventEmitter () {};

    /**
     * Adds a listener
     *
     * @api public
     */

    EventEmitter.prototype.on = function (name, fn) {
      if (!this.$events) {
        this.$events = {};
      }

      if (!this.$events[name]) {
        this.$events[name] = fn;
      } else if (io.util.isArray(this.$events[name])) {
        this.$events[name].push(fn);
      } else {
        this.$events[name] = [this.$events[name], fn];
      }

      return this;
    };

    EventEmitter.prototype.addListener = EventEmitter.prototype.on;

    /**
     * Adds a volatile listener.
     *
     * @api public
     */

    EventEmitter.prototype.once = function (name, fn) {
      var self = this;

      function on () {
        self.removeListener(name, on);
        fn.apply(this, arguments);
      };

      on.listener = fn;
      this.on(name, on);

      return this;
    };

    /**
     * Removes a listener.
     *
     * @api public
     */

    EventEmitter.prototype.removeListener = function (name, fn) {
      if (this.$events && this.$events[name]) {
        var list = this.$events[name];

        if (io.util.isArray(list)) {
          var pos = -1;

          for (var i = 0, l = list.length; i < l; i++) {
            if (list[i] === fn || (list[i].listener && list[i].listener === fn)) {
              pos = i;
              break;
            }
          }

          if (pos < 0) {
            return this;
          }

          list.splice(pos, 1);

          if (!list.length) {
            delete this.$events[name];
          }
        } else if (list === fn || (list.listener && list.listener === fn)) {
          delete this.$events[name];
        }
      }

      return this;
    };

    /**
     * Removes all listeners for an event.
     *
     * @api public
     */

    EventEmitter.prototype.removeAllListeners = function (name) {
      // TODO: enable this when node 0.5 is stable
      //if (name === undefined) {
        //this.$events = {};
        //return this;
      //}

      if (this.$events && this.$events[name]) {
        this.$events[name] = null;
      }

      return this;
    };

    /**
     * Gets all listeners for a certain event.
     *
     * @api publci
     */

    EventEmitter.prototype.listeners = function (name) {
      if (!this.$events) {
        this.$events = {};
      }

      if (!this.$events[name]) {
        this.$events[name] = [];
      }

      if (!io.util.isArray(this.$events[name])) {
        this.$events[name] = [this.$events[name]];
      }

      return this.$events[name];
    };

    /**
     * Emits an event.
     *
     * @api public
     */

    EventEmitter.prototype.emit = function (name) {
      if (!this.$events) {
        return false;
      }

      var handler = this.$events[name];

      if (!handler) {
        return false;
      }

      var args = Array.prototype.slice.call(arguments, 1);

      if ('function' == typeof handler) {
        handler.apply(this, args);
      } else if (io.util.isArray(handler)) {
        var listeners = handler.slice();

        for (var i = 0, l = listeners.length; i < l; i++) {
          listeners[i].apply(this, args);
        }
      } else {
        return false;
      }

      return true;
    };

  })(
      'undefined' != typeof io ? io : modules.exportss
    , 'undefined' != typeof io ? io : modules.parent.exportss
  );

  /**
   * socket.io
   * Copyright(c) 2011 LearnBoost <dev@learnboost.com>
   * MIT Licensed
   */

  /**
   * Based on JSON2 (http://www.JSON.org/js.html).
   */

  (function (exportss, nativeJSON) {
    "use strict";

    // use native JSON if it's available
    if (nativeJSON && nativeJSON.parse){
      return exportss.JSON = {
        parse: nativeJSON.parse
      , stringify: nativeJSON.stringify
      }
    }

    var JSON = exportss.JSON = {};

    function f(n) {
        // Format integers to have at least two digits.
        return n < 10 ? '0' + n : n;
    }

    function date(d, key) {
      return isFinite(d.valueOf()) ?
          d.getUTCFullYear()     + '-' +
          f(d.getUTCMonth() + 1) + '-' +
          f(d.getUTCDate())      + 'T' +
          f(d.getUTCHours())     + ':' +
          f(d.getUTCMinutes())   + ':' +
          f(d.getUTCSeconds())   + 'Z' : null;
    };

    var cx = /[\u0000\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g,
        escapable = /[\\\"\x00-\x1f\x7f-\x9f\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g,
        gap,
        indent,
        meta = {    // table of character substitutions
            '\b': '\\b',
            '\t': '\\t',
            '\n': '\\n',
            '\f': '\\f',
            '\r': '\\r',
            '"' : '\\"',
            '\\': '\\\\'
        },
        rep;


    function quote(string) {

  // If the string contains no control characters, no quote characters, and no
  // backslash characters, then we can safely slap some quotes around it.
  // Otherwise we must also replace the offending characters with safe escape
  // sequences.

        escapable.lastIndex = 0;
        return escapable.test(string) ? '"' + string.replace(escapable, function (a) {
            var c = meta[a];
            return typeof c === 'string' ? c :
                '\\u' + ('0000' + a.charCodeAt(0).toString(16)).slice(-4);
        }) + '"' : '"' + string + '"';
    }


    function str(key, holder) {

  // Produce a string from holder[key].

        var i,          // The loop counter.
            k,          // The member key.
            v,          // The member value.
            length,
            mind = gap,
            partial,
            value = holder[key];

  // If the value has a toJSON method, call it to obtain a replacement value.

        if (value instanceof Date) {
            value = date(key);
        }

  // If we were called with a replacer function, then call the replacer to
  // obtain a replacement value.

        if (typeof rep === 'function') {
            value = rep.call(holder, key, value);
        }

  // What happens next depends on the value's type.

        switch (typeof value) {
        case 'string':
            return quote(value);

        case 'number':

  // JSON numbers must be finite. Encode non-finite numbers as null.

            return isFinite(value) ? String(value) : 'null';

        case 'boolean':
        case 'null':

  // If the value is a boolean or null, convert it to a string. Note:
  // typeof null does not produce 'null'. The case is included here in
  // the remote chance that this gets fixed someday.

            return String(value);

  // If the type is 'object', we might be dealing with an object or an array or
  // null.

        case 'object':

  // Due to a specification blunder in ECMAScript, typeof null is 'object',
  // so watch out for that case.

            if (!value) {
                return 'null';
            }

  // Make an array to hold the partial results of stringifying this object value.

            gap += indent;
            partial = [];

  // Is the value an array?

            if (Object.prototype.toString.apply(value) === '[object Array]') {

  // The value is an array. Stringify every element. Use null as a placeholder
  // for non-JSON values.

                length = value.length;
                for (i = 0; i < length; i += 1) {
                    partial[i] = str(i, value) || 'null';
                }

  // Join all of the elements together, separated with commas, and wrap them in
  // brackets.

                v = partial.length === 0 ? '[]' : gap ?
                    '[\n' + gap + partial.join(',\n' + gap) + '\n' + mind + ']' :
                    '[' + partial.join(',') + ']';
                gap = mind;
                return v;
            }

  // If the replacer is an array, use it to select the members to be stringified.

            if (rep && typeof rep === 'object') {
                length = rep.length;
                for (i = 0; i < length; i += 1) {
                    if (typeof rep[i] === 'string') {
                        k = rep[i];
                        v = str(k, value);
                        if (v) {
                            partial.push(quote(k) + (gap ? ': ' : ':') + v);
                        }
                    }
                }
            } else {

  // Otherwise, iterate through all of the keys in the object.

                for (k in value) {
                    if (Object.prototype.hasOwnProperty.call(value, k)) {
                        v = str(k, value);
                        if (v) {
                            partial.push(quote(k) + (gap ? ': ' : ':') + v);
                        }
                    }
                }
            }

  // Join all of the member texts together, separated with commas,
  // and wrap them in braces.

            v = partial.length === 0 ? '{}' : gap ?
                '{\n' + gap + partial.join(',\n' + gap) + '\n' + mind + '}' :
                '{' + partial.join(',') + '}';
            gap = mind;
            return v;
        }
    }

  // If the JSON object does not yet have a stringify method, give it one.

    JSON.stringify = function (value, replacer, space) {

  // The stringify method takes a value and an optional replacer, and an optional
  // space parameter, and returns a JSON text. The replacer can be a function
  // that can replace values, or an array of strings that will select the keys.
  // A default replacer method can be provided. Use of the space parameter can
  // produce text that is more easily readable.

        var i;
        gap = '';
        indent = '';

  // If the space parameter is a number, make an indent string containing that
  // many spaces.

        if (typeof space === 'number') {
            for (i = 0; i < space; i += 1) {
                indent += ' ';
            }

  // If the space parameter is a string, it will be used as the indent string.

        } else if (typeof space === 'string') {
            indent = space;
        }

  // If there is a replacer, it must be a function or an array.
  // Otherwise, throw an error.

        rep = replacer;
        if (replacer && typeof replacer !== 'function' &&
                (typeof replacer !== 'object' ||
                typeof replacer.length !== 'number')) {
            throw new Error('JSON.stringify');
        }

  // Make a fake root object containing our value under the key of ''.
  // Return the result of stringifying the value.

        return str('', {'': value});
    };

  // If the JSON object does not yet have a parse method, give it one.

    JSON.parse = function (text, reviver) {
    // The parse method takes a text and an optional reviver function, and returns
    // a JavaScript value if the text is a valid JSON text.

        var j;

        function walk(holder, key) {

    // The walk method is used to recursively walk the resulting structure so
    // that modifications can be made.

            var k, v, value = holder[key];
            if (value && typeof value === 'object') {
                for (k in value) {
                    if (Object.prototype.hasOwnProperty.call(value, k)) {
                        v = walk(value, k);
                        if (v !== undefined) {
                            value[k] = v;
                        } else {
                            delete value[k];
                        }
                    }
                }
            }
            return reviver.call(holder, key, value);
        }


    // Parsing happens in four stages. In the first stage, we replace certain
    // Unicode characters with escape sequences. JavaScript handles many characters
    // incorrectly, either silently deleting them, or treating them as line endings.

        text = String(text);
        cx.lastIndex = 0;
        if (cx.test(text)) {
            text = text.replace(cx, function (a) {
                return '\\u' +
                    ('0000' + a.charCodeAt(0).toString(16)).slice(-4);
            });
        }

    // In the second stage, we run the text against regular expressions that look
    // for non-JSON patterns. We are especially concerned with '()' and 'new'
    // because they can cause invocation, and '=' because it can cause mutation.
    // But just to be safe, we want to reject all unexpected forms.

    // We split the second stage into 4 regexp operations in order to work around
    // crippling inefficiencies in IE's and Safari's regexp engines. First we
    // replace the JSON backslash pairs with '@' (a non-JSON character). Second, we
    // replace all simple value tokens with ']' characters. Third, we delete all
    // open brackets that follow a colon or comma or that begin the text. Finally,
    // we look to see that the remaining characters are only whitespace or ']' or
    // ',' or ':' or '{' or '}'. If that is so, then the text is safe for eval.

        if (/^[\],:{}\s]*$/
                .test(text.replace(/\\(?:["\\\/bfnrt]|u[0-9a-fA-F]{4})/g, '@')
                    .replace(/"[^"\\\n\r]*"|true|false|null|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?/g, ']')
                    .replace(/(?:^|:|,)(?:\s*\[)+/g, ''))) {

    // In the third stage we use the eval function to compile the text into a
    // JavaScript structure. The '{' operator is subject to a syntactic ambiguity
    // in JavaScript: it can begin a block or an object literal. We wrap the text
    // in parens to eliminate the ambiguity.

            j = eval('(' + text + ')');

    // In the optional fourth stage, we recursively walk the new structure, passing
    // each name/value pair to a reviver function for possible transformation.

            return typeof reviver === 'function' ?
                walk({'': j}, '') : j;
        }

    // If the text is not JSON parseable, then a SyntaxError is thrown.

        throw new SyntaxError('JSON.parse');
    };

  })(
      'undefined' != typeof io ? io : modules.exportss
    , typeof JSON !== 'undefined' ? JSON : undefined
  );

  /**
   * socket.io
   * Copyright(c) 2011 LearnBoost <dev@learnboost.com>
   * MIT Licensed
   */

  (function (exportss, io) {

    /**
     * Parser namespace.
     *
     * @namespace
     */

    var parser = exportss.parser = {};

    /**
     * Packet types.
     */

    var packets = parser.packets = [
        'disconnect'
      , 'connect'
      , 'heartbeat'
      , 'message'
      , 'json'
      , 'event'
      , 'ack'
      , 'error'
      , 'noop'
    ];

    /**
     * Errors reasons.
     */

    var reasons = parser.reasons = [
        'transport not supported'
      , 'client not handshaken'
      , 'unauthorized'
    ];

    /**
     * Errors advice.
     */

    var advice = parser.advice = [
        'reconnect'
    ];

    /**
     * Shortcuts.
     */

    var JSON = io.JSON
      , indexOf = io.util.indexOf;

    /**
     * Encodes a packet.
     *
     * @api private
     */

    parser.encodePacket = function (packet) {
      var type = indexOf(packets, packet.type)
        , id = packet.id || ''
        , endpoint = packet.endpoint || ''
        , ack = packet.ack
        , data = null;

      switch (packet.type) {
        case 'error':
          var reason = packet.reason ? indexOf(reasons, packet.reason) : ''
            , adv = packet.advice ? indexOf(advice, packet.advice) : '';

          if (reason !== '' || adv !== '')
            data = reason + (adv !== '' ? ('+' + adv) : '');

          break;

        case 'message':
          if (packet.data !== '')
            data = packet.data;
          break;

        case 'event':
          var ev = { name: packet.name };

          if (packet.args && packet.args.length) {
            ev.args = packet.args;
          }

          data = JSON.stringify(ev);
          break;

        case 'json':
          data = JSON.stringify(packet.data);
          break;

        case 'connect':
          if (packet.qs)
            data = packet.qs;
          break;

        case 'ack':
          data = packet.ackId
            + (packet.args && packet.args.length
                ? '+' + JSON.stringify(packet.args) : '');
          break;
      }

      // construct packet with required fragments
      var encoded = [
          type
        , id + (ack == 'data' ? '+' : '')
        , endpoint
      ];

      // data fragment is optional
      if (data !== null && data !== undefined)
        encoded.push(data);

      return encoded.join(':');
    };

    /**
     * Encodes multiple messages (payload).
     *
     * @param {Array} messages
     * @api private
     */

    parser.encodePayload = function (packets) {
      var decoded = '';

      if (packets.length == 1)
        return packets[0];

      for (var i = 0, l = packets.length; i < l; i++) {
        var packet = packets[i];
        decoded += '\ufffd' + packet.length + '\ufffd' + packets[i];
      }

      return decoded;
    };

    /**
     * Decodes a packet
     *
     * @api private
     */

    var regexp = /([^:]+):([0-9]+)?(\+)?:([^:]+)?:?([\s\S]*)?/;

    parser.decodePacket = function (data) {
      var pieces = data.match(regexp);

      if (!pieces) return {};

      var id = pieces[2] || ''
        , data = pieces[5] || ''
        , packet = {
              type: packets[pieces[1]]
            , endpoint: pieces[4] || ''
          };

      // whether we need to acknowledge the packet
      if (id) {
        packet.id = id;
        if (pieces[3])
          packet.ack = 'data';
        else
          packet.ack = true;
      }

      // handle different packet types
      switch (packet.type) {
        case 'error':
          var pieces = data.split('+');
          packet.reason = reasons[pieces[0]] || '';
          packet.advice = advice[pieces[1]] || '';
          break;

        case 'message':
          packet.data = data || '';
          break;

        case 'event':
          try {
            var opts = JSON.parse(data);
            packet.name = opts.name;
            packet.args = opts.args;
          } catch (e) { }

          packet.args = packet.args || [];
          break;

        case 'json':
          try {
            packet.data = JSON.parse(data);
          } catch (e) { }
          break;

        case 'connect':
          packet.qs = data || '';
          break;

        case 'ack':
          var pieces = data.match(/^([0-9]+)(\+)?(.*)/);
          if (pieces) {
            packet.ackId = pieces[1];
            packet.args = [];

            if (pieces[3]) {
              try {
                packet.args = pieces[3] ? JSON.parse(pieces[3]) : [];
              } catch (e) { }
            }
          }
          break;

        case 'disconnect':
        case 'heartbeat':
          break;
      };

      return packet;
    };

    /**
     * Decodes data payload. Detects multiple messages
     *
     * @return {Array} messages
     * @api public
     */

    parser.decodePayload = function (data) {
      // IE doesn't like data[i] for unicode chars, charAt works fine
      if (data.charAt(0) == '\ufffd') {
        var ret = [];

        for (var i = 1, length = ''; i < data.length; i++) {
          if (data.charAt(i) == '\ufffd') {
            ret.push(parser.decodePacket(data.substr(i + 1).substr(0, length)));
            i += Number(length) + 1;
            length = '';
          } else {
            length += data.charAt(i);
          }
        }

        return ret;
      } else {
        return [parser.decodePacket(data)];
      }
    };

  })(
      'undefined' != typeof io ? io : modules.exportss
    , 'undefined' != typeof io ? io : modules.parent.exportss
  );

  /**
   * socket.io
   * Copyright(c) 2011 LearnBoost <dev@learnboost.com>
   * MIT Licensed
   */

  (function (exportss, io) {

    /**
     * Expose constructor.
     */

    exportss.Transport = Transport;

    /**
     * This is the transport template for all supported transport methods.
     *
     * @constructor
     * @api public
     */

    function Transport (socket, sessid) {
      this.socket = socket;
      this.sessid = sessid;
    };

    /**
     * Apply EventEmitter mixin.
     */

    io.util.mixin(Transport, io.EventEmitter);

    /**
     * Handles the response from the server. When a new response is received
     * it will automatically update the timeout, decode the message and
     * forwards the response to the onMessage function for further processing.
     *
     * @param {String} data Response from the server.
     * @api private
     */

    Transport.prototype.onData = function (data) {
      this.clearCloseTimeout();
      this.setCloseTimeout();

      if (data !== '') {
        // todo: we should only do decodePayload for xhr transports
        var msgs = io.parser.decodePayload(data);

        if (msgs && msgs.length) {
          for (var i = 0, l = msgs.length; i < l; i++) {
            this.onPacket(msgs[i]);
          }
        }
      }

      return this;
    };

    /**
     * Handles packets.
     *
     * @api private
     */

    Transport.prototype.onPacket = function (packet) {
      if (packet.type == 'heartbeat') {
        return this.onHeartbeat();
      }

      if (packet.type == 'connect' && packet.endpoint == '') {
        this.onConnect();
      }

      this.socket.onPacket(packet);

      return this;
    };

    /**
     * Sets close timeout
     *
     * @api private
     */
    
    Transport.prototype.setCloseTimeout = function () {
      if (!this.closeTimeout) {
        var self = this;

        this.closeTimeout = setTimeout(function () {
          self.onDisconnect();
        }, this.socket.closeTimeout);
      }
    };

    /**
     * Called when transport disconnects.
     *
     * @api private
     */

    Transport.prototype.onDisconnect = function () {
      if (this.close) this.close();
      this.clearTimeouts();
      this.socket.onDisconnect();
      return this;
    };

    /**
     * Called when transport connects
     *
     * @api private
     */

    Transport.prototype.onConnect = function () {
      this.socket.onConnect();
      return this;
    }

    /**
     * Clears close timeout
     *
     * @api private
     */

    Transport.prototype.clearCloseTimeout = function () {
      if (this.closeTimeout) {
        clearTimeout(this.closeTimeout);
        this.closeTimeout = null;
      }
    };

    /**
     * Clear timeouts
     *
     * @api private
     */

    Transport.prototype.clearTimeouts = function () {
      this.clearCloseTimeout();

      if (this.reopenTimeout) {
        clearTimeout(this.reopenTimeout);
      }
    };

    /**
     * Sends a packet
     *
     * @param {Object} packet object.
     * @api private
     */

    Transport.prototype.packet = function (packet) {
      this.send(io.parser.encodePacket(packet));
    };

    /**
     * Send the received heartbeat message back to server. So the server
     * knows we are still connected.
     *
     * @param {String} heartbeat Heartbeat response from the server.
     * @api private
     */

    Transport.prototype.onHeartbeat = function (heartbeat) {
      this.packet({ type: 'heartbeat' });
    };
   
    /**
     * Called when the transport opens.
     *
     * @api private
     */

    Transport.prototype.onOpen = function () {
      this.open = true;
      this.clearCloseTimeout();
      this.socket.onOpen();
    };

    /**
     * Notifies the base when the connection with the Socket.IO server
     * has been disconnected.
     *
     * @api private
     */

    Transport.prototype.onClose = function () {
      var self = this;

      /* FIXME: reopen delay causing a infinit loop
      this.reopenTimeout = setTimeout(function () {
        self.open();
      }, this.socket.options['reopen delay']);*/

      this.open = false;
      this.setCloseTimeout();
      this.socket.onClose();
    };

    /**
     * Generates a connection url based on the Socket.IO URL Protocol.
     * See <https://github.com/learnboost/socket.io-node/> for more details.
     *
     * @returns {String} Connection url
     * @api private
     */

    Transport.prototype.prepareUrl = function () {
      var options = this.socket.options;

      return this.scheme() + '://'
        + options.host + ':' + options.port + '/'
        + options.resource + '/' + io.protocol
        + '/' + this.name + '/' + this.sessid;
    };

    /**
     * Checks if the transport is ready to start a connection.
     *
     * @param {Socket} socket The socket instance that needs a transport
     * @param {Function} fn The callback
     * @api private
     */

    Transport.prototype.ready = function (socket, fn) {
      fn.call(this);
    };
  })(
      'undefined' != typeof io ? io : modules.exportss
    , 'undefined' != typeof io ? io : modules.parent.exportss
  );

  /**
   * socket.io
   * Copyright(c) 2011 LearnBoost <dev@learnboost.com>
   * MIT Licensed
   */

  (function (exportss, io, global) {

    /**
     * Expose constructor.
     */

    exportss.Socket = Socket;

    /**
     * Create a new `Socket.IO client` which can establish a persistent
     * connection with a Socket.IO enabled server.
     *
     * @api public
     */

    function Socket (options) {
      this.options = {
          port: 80
        , secure: false
        , document: 'document' in global ? document : false
        , resource: 'socket.io'
        , transports: io.transports
        , 'connect timeout': 10000
        , 'try multiple transports': true
        , 'reconnect': true
        , 'reconnection delay': 500
        , 'reconnection limit': Infinity
        , 'reopen delay': 3000
        , 'max reconnection attempts': 10
        , 'sync disconnect on unload': true
        , 'auto connect': true
        , 'flash policy port': 10843
      };

      io.util.merge(this.options, options);

      this.connected = false;
      this.open = false;
      this.connecting = false;
      this.reconnecting = false;
      this.namespaces = {};
      this.buffer = [];
      this.doBuffer = false;

      if (this.options['sync disconnect on unload'] &&
          (!this.isXDomain() || io.util.ua.hasCORS)) {
        var self = this;

        io.util.on(global, 'beforeunload', function () {
          self.disconnectSync();
        }, false);
      }

      if (this.options['auto connect']) {
        this.connect();
      }
  };

    /**
     * Apply EventEmitter mixin.
     */

    io.util.mixin(Socket, io.EventEmitter);

    /**
     * Returns a namespace listener/emitter for this socket
     *
     * @api public
     */

    Socket.prototype.of = function (name) {
      if (!this.namespaces[name]) {
        this.namespaces[name] = new io.SocketNamespace(this, name);

        if (name !== '') {
          this.namespaces[name].packet({ type: 'connect' });
        }
      }

      return this.namespaces[name];
    };

    /**
     * Emits the given event to the Socket and all namespaces
     *
     * @api private
     */

    Socket.prototype.publish = function () {
      this.emit.apply(this, arguments);

      var nsp;

      for (var i in this.namespaces) {
        if (this.namespaces.hasOwnProperty(i)) {
          nsp = this.of(i);
          nsp.$emit.apply(nsp, arguments);
        }
      }
    };

    /**
     * Performs the handshake
     *
     * @api private
     */

    function empty () { };

    Socket.prototype.handshake = function (fn) {
      var self = this
        , options = this.options;

      function complete (data) {
        if (data instanceof Error) {
          self.onError(data.message);
        } else {
          fn.apply(null, data.split(':'));
        }
      };

      var url = [
            'http' + (options.secure ? 's' : '') + ':/'
          , options.host + ':' + options.port
          , this.options.resource
          , io.protocol
          , io.util.query(this.options.query, 't=' + +new Date)
        ].join('/');

      if (this.isXDomain()) {
        var insertAt = document.getElementsByTagName('script')[0]
          , script = document.createElement('script');

        script.src = url + '&jsonp=' + io.j.length;
        insertAt.parentNode.insertBefore(script, insertAt);

        io.j.push(function (data) {
          complete(data);
          script.parentNode.removeChild(script);
        });
      } else {
        var xhr = io.util.request();

        xhr.open('GET', url, true);
        xhr.onreadystatechange = function () {
          if (xhr.readyState == 4) {
            xhr.onreadystatechange = empty;

            if (xhr.status == 200) {
              complete(xhr.responseText);
            } else {
              !self.reconnecting && self.onError(xhr.responseText);
            }
          }
        };
        xhr.send(null);
      }
    };

    /**
     * Find an available transport based on the options supplied in the constructor.
     *
     * @api private
     */

    Socket.prototype.getTransport = function (override) {
      var transports = override || this.transports, match;

      for (var i = 0, transport; transport = transports[i]; i++) {
        if (io.Transport[transport]
          && io.Transport[transport].check(this)
          && (!this.isXDomain() || io.Transport[transport].xdomainCheck())) {
          return new io.Transport[transport](this, this.sessionid);
        }
      }

      return null;
    };

    /**
     * Connects to the server.
     *
     * @param {Function} [fn] Callback.
     * @returns {io.Socket}
     * @api public
     */

    Socket.prototype.connect = function (fn) {
      if (this.connecting) {
        return this;
      }

      var self = this;

      this.handshake(function (sid, heartbeat, close, transports) {
        self.sessionid = sid;
        self.closeTimeout = close * 1000;
        self.heartbeatTimeout = heartbeat * 1000;
        self.transports = io.util.intersect(
            transports.split(',')
          , self.options.transports
        );

        function connect (transports){
          if (self.transport) self.transport.clearTimeouts();

          self.transport = self.getTransport(transports);
          if (!self.transport) return self.publish('connect_failed');

          // once the transport is ready
          self.transport.ready(self, function () {
            self.connecting = true;
            self.publish('connecting', self.transport.name);
            self.transport.open();

            if (self.options['connect timeout']) {
              self.connectTimeoutTimer = setTimeout(function () {
                if (!self.connected) {
                  self.connecting = false;

                  if (self.options['try multiple transports']) {
                    if (!self.remainingTransports) {
                      self.remainingTransports = self.transports.slice(0);
                    }

                    var remaining = self.remainingTransports;

                    while (remaining.length > 0 && remaining.splice(0,1)[0] !=
                           self.transport.name) {}

                      if (remaining.length){
                        connect(remaining);
                      } else {
                        self.publish('connect_failed');
                      }
                  }
                }
              }, self.options['connect timeout']);
            }
          });
        }

        connect();

        self.once('connect', function (){
          clearTimeout(self.connectTimeoutTimer);

          fn && typeof fn == 'function' && fn();
        });
      });

      return this;
    };

    /**
     * Sends a message.
     *
     * @param {Object} data packet.
     * @returns {io.Socket}
     * @api public
     */

    Socket.prototype.packet = function (data) {
      if (this.connected && !this.doBuffer) {
        this.transport.packet(data);
      } else {
        this.buffer.push(data);
      }

      return this;
    };

    /**
     * Sets buffer state
     *
     * @api private
     */

    Socket.prototype.setBuffer = function (v) {
      this.doBuffer = v;

      if (!v && this.connected && this.buffer.length) {
        this.transport.payload(this.buffer);
        this.buffer = [];
      }
    };

    /**
     * Disconnect the established connect.
     *
     * @returns {io.Socket}
     * @api public
     */

    Socket.prototype.disconnect = function () {
      if (this.connected) {
        if (this.open) {
          this.of('').packet({ type: 'disconnect' });
        }

        // handle disconnection immediately
        this.onDisconnect('booted');
      }

      return this;
    };

    /**
     * Disconnects the socket with a sync XHR.
     *
     * @api private
     */

    Socket.prototype.disconnectSync = function () {
      // ensure disconnection
      var xhr = io.util.request()
        , uri = this.resource + '/' + io.protocol + '/' + this.sessionid;

      xhr.open('GET', uri, true);

      // handle disconnection immediately
      this.onDisconnect('booted');
    };

    /**
     * Check if we need to use cross domain enabled transports. Cross domain would
     * be a different port or different domain name.
     *
     * @returns {Boolean}
     * @api private
     */

    Socket.prototype.isXDomain = function () {

      var port = window.location.port ||
        ('https:' == window.location.protocol ? 443 : 80);

      return this.options.host !== document.domain || this.options.port != port;
    };

    /**
     * Called upon handshake.
     *
     * @api private
     */

    Socket.prototype.onConnect = function () {
      if (!this.connected) {
        this.connected = true;
        this.connecting = false;
        if (!this.doBuffer) {
          // make sure to flush the buffer
          this.setBuffer(false);
        }
        this.emit('connect');
      }
    };

    /**
     * Called when the transport opens
     *
     * @api private
     */

    Socket.prototype.onOpen = function () {
      this.open = true;
    };

    /**
     * Called when the transport closes.
     *
     * @api private
     */

    Socket.prototype.onClose = function () {
      this.open = false;
    };

    /**
     * Called when the transport first opens a connection
     *
     * @param text
     */

    Socket.prototype.onPacket = function (packet) {
      this.of(packet.endpoint).onPacket(packet);
    };

    /**
     * Handles an error.
     *
     * @api private
     */

    Socket.prototype.onError = function (err) {
      if (err && err.advice) {
        if (err.advice === 'reconnect' && this.connected) {
          this.disconnect();
          this.reconnect();
        }
      }

      this.publish('error', err && err.reason ? err.reason : err);
    };

    /**
     * Called when the transport disconnects.
     *
     * @api private
     */

    Socket.prototype.onDisconnect = function (reason) {
      var wasConnected = this.connected;

      this.connected = false;
      this.connecting = false;
      this.open = false;

      if (wasConnected) {
        this.transport.close();
        this.transport.clearTimeouts();
        this.publish('disconnect', reason);

        if ('booted' != reason && this.options.reconnect && !this.reconnecting) {
          this.reconnect();
        }
      }
    };

    /**
     * Called upon reconnection.
     *
     * @api private
     */

    Socket.prototype.reconnect = function () {
      this.reconnecting = true;
      this.reconnectionAttempts = 0;
      this.reconnectionDelay = this.options['reconnection delay'];

      var self = this
        , maxAttempts = this.options['max reconnection attempts']
        , tryMultiple = this.options['try multiple transports']
        , limit = this.options['reconnection limit'];

      function reset () {
        if (self.connected) {
          for (var i in self.namespaces) {
            if (self.namespaces.hasOwnProperty(i) && '' !== i) {
                self.namespaces[i].packet({ type: 'connect' });
            }
          }
          self.publish('reconnect', self.transport.name, self.reconnectionAttempts);
        }

        self.removeListener('connect_failed', maybeReconnect);
        self.removeListener('connect', maybeReconnect);

        self.reconnecting = false;

        delete self.reconnectionAttempts;
        delete self.reconnectionDelay;
        delete self.reconnectionTimer;
        delete self.redoTransports;

        self.options['try multiple transports'] = tryMultiple;
      };

      function maybeReconnect () {
        if (!self.reconnecting) {
          return;
        }

        if (self.connected) {
          return reset();
        };

        if (self.connecting && self.reconnecting) {
          return self.reconnectionTimer = setTimeout(maybeReconnect, 1000);
        }

        if (self.reconnectionAttempts++ >= maxAttempts) {
          if (!self.redoTransports) {
            self.on('connect_failed', maybeReconnect);
            self.options['try multiple transports'] = true;
            self.transport = self.getTransport();
            self.redoTransports = true;
            self.connect();
          } else {
            self.publish('reconnect_failed');
            reset();
          }
        } else {
          if (self.reconnectionDelay < limit) {
            self.reconnectionDelay *= 2; // exponential back off
          }

          self.connect();
          self.publish('reconnecting', self.reconnectionDelay, self.reconnectionAttempts);
          self.reconnectionTimer = setTimeout(maybeReconnect, self.reconnectionDelay);
        }
      };

      this.options['try multiple transports'] = false;
      this.reconnectionTimer = setTimeout(maybeReconnect, this.reconnectionDelay);

      this.on('connect', maybeReconnect);
    };

  })(
      'undefined' != typeof io ? io : modules.exportss
    , 'undefined' != typeof io ? io : modules.parent.exportss
    , this
  );
  /**
   * socket.io
   * Copyright(c) 2011 LearnBoost <dev@learnboost.com>
   * MIT Licensed
   */

  (function (exportss, io) {

    /**
     * Expose constructor.
     */

    exportss.SocketNamespace = SocketNamespace;

    /**
     * Socket namespace constructor.
     *
     * @constructor
     * @api public
     */

    function SocketNamespace (socket, name) {
      this.socket = socket;
      this.name = name || '';
      this.flags = {};
      this.json = new Flag(this, 'json');
      this.ackPackets = 0;
      this.acks = {};
    };

    /**
     * Apply EventEmitter mixin.
     */

    io.util.mixin(SocketNamespace, io.EventEmitter);

    /**
     * Copies emit since we override it
     *
     * @api private
     */

    SocketNamespace.prototype.$emit = io.EventEmitter.prototype.emit;

    /**
     * Creates a new namespace, by proxying the request to the socket. This
     * allows us to use the synax as we do on the server.
     *
     * @api public
     */

    SocketNamespace.prototype.of = function () {
      return this.socket.of.apply(this.socket, arguments);
    };

    /**
     * Sends a packet.
     *
     * @api private
     */

    SocketNamespace.prototype.packet = function (packet) {
      packet.endpoint = this.name;
      this.socket.packet(packet);
      this.flags = {};
      return this;
    };

    /**
     * Sends a message
     *
     * @api public
     */

    SocketNamespace.prototype.send = function (data, fn) {
      var packet = {
          type: this.flags.json ? 'json' : 'message'
        , data: data
      };

      if ('function' == typeof fn) {
        packet.id = ++this.ackPackets;
        packet.ack = true;
        this.acks[packet.id] = fn;
      }

      return this.packet(packet);
    };

    /**
     * Emits an event
     *
     * @api public
     */
    
    SocketNamespace.prototype.emit = function (name) {
      var args = Array.prototype.slice.call(arguments, 1)
        , lastArg = args[args.length - 1]
        , packet = {
              type: 'event'
            , name: name
          };

      if ('function' == typeof lastArg) {
        packet.id = ++this.ackPackets;
        packet.ack = 'data';
        this.acks[packet.id] = lastArg;
        args = args.slice(0, args.length - 1);
      }

      packet.args = args;

      return this.packet(packet);
    };

    /**
     * Disconnects the namespace
     *
     * @api private
     */

    SocketNamespace.prototype.disconnect = function () {
      if (this.name === '') {
        this.socket.disconnect();
      } else {
        this.packet({ type: 'disconnect' });
        this.$emit('disconnect');
      }

      return this;
    };

    /**
     * Handles a packet
     *
     * @api private
     */

    SocketNamespace.prototype.onPacket = function (packet) {
      var self = this;

      function ack () {
        self.packet({
            type: 'ack'
          , args: io.util.toArray(arguments)
          , ackId: packet.id
        });
      };

      switch (packet.type) {
        case 'connect':
          this.$emit('connect');
          break;

        case 'disconnect':
          if (this.name === '') {
            this.socket.onDisconnect(packet.reason || 'booted');
          } else {
            this.$emit('disconnect', packet.reason);
          }
          break;

        case 'message':
        case 'json':
          var params = ['message', packet.data];

          if (packet.ack == 'data') {
            params.push(ack);
          } else if (packet.ack) {
            this.packet({ type: 'ack', ackId: packet.id });
          }

          this.$emit.apply(this, params);
          break;

        case 'event':
          var params = [packet.name].concat(packet.args);

          if (packet.ack == 'data')
            params.push(ack);

          this.$emit.apply(this, params);
          break;

        case 'ack':
          if (this.acks[packet.ackId]) {
            this.acks[packet.ackId].apply(this, packet.args);
            delete this.acks[packet.ackId];
          }
          break;

        case 'error':
          if (packet.advice){
            this.socket.onError(packet);
          } else {
            if (packet.reason == 'unauthorized') {
              this.$emit('connect_failed', packet.reason);
            } else {
              this.$emit('error', packet.reason);
            }
          }
          break;
      }
    };

    /**
     * Flag interface.
     *
     * @api private
     */

    function Flag (nsp, name) {
      this.namespace = nsp;
      this.name = name;
    };

    /**
     * Send a message
     *
     * @api public
     */

    Flag.prototype.send = function () {
      this.namespace.flags[this.name] = true;
      this.namespace.send.apply(this.namespace, arguments);
    };

    /**
     * Emit an event
     *
     * @api public
     */

    Flag.prototype.emit = function () {
      this.namespace.flags[this.name] = true;
      this.namespace.emit.apply(this.namespace, arguments);
    };

  })(
      'undefined' != typeof io ? io : modules.exportss
    , 'undefined' != typeof io ? io : modules.parent.exportss
  );

  /**
   * socket.io
   * Copyright(c) 2011 LearnBoost <dev@learnboost.com>
   * MIT Licensed
   */

  (function (exportss, io) {

    /**
     * Expose constructor.
     */

    exportss.websocket = WS;

    /**
     * The WebSocket transport uses the HTML5 WebSocket API to establish an
     * persistent connection with the Socket.IO server. This transport will also
     * be inherited by the FlashSocket fallback as it provides a API compatible
     * polyfill for the WebSockets.
     *
     * @constructor
     * @extends {io.Transport}
     * @api public
     */

    function WS (socket) {
      io.Transport.apply(this, arguments);
    };

    /**
     * Inherits from Transport.
     */

    io.util.inherit(WS, io.Transport);

    /**
     * Transport name
     *
     * @api public
     */

    WS.prototype.name = 'websocket';

    /**
     * Initializes a new `WebSocket` connection with the Socket.IO server. We attach
     * all the appropriate listeners to handle the responses from the server.
     *
     * @returns {Transport}
     * @api public
     */

    WS.prototype.open = function () {
      var query = io.util.query(this.socket.options.query)
        , self = this
        , Socket


      if (!Socket) {
        Socket = window.MozWebSocket || window.WebSocket;
      }

      this.websocket = new Socket(this.prepareUrl() + query);

      this.websocket.onopen = function () {
        self.onOpen();
        self.socket.setBuffer(false);
      };
      this.websocket.onmessage = function (ev) {
        self.onData(ev.data);
      };
      this.websocket.onclose = function () {
        self.onClose();
        self.socket.setBuffer(true);
      };
      this.websocket.onerror = function (e) {
        self.onError(e);
      };

      return this;
    };

    /**
     * Send a message to the Socket.IO server. The message will automatically be
     * encoded in the correct message format.
     *
     * @returns {Transport}
     * @api public
     */

    WS.prototype.send = function (data) {
      this.websocket.send(data);
      return this;
    };

    /**
     * Payload
     *
     * @api private
     */

    WS.prototype.payload = function (arr) {
      for (var i = 0, l = arr.length; i < l; i++) {
        this.packet(arr[i]);
      }
      return this;
    };

    /**
     * Disconnect the established `WebSocket` connection.
     *
     * @returns {Transport}
     * @api public
     */

    WS.prototype.close = function () {
      this.websocket.close();
      return this;
    };

    /**
     * Handle the errors that `WebSocket` might be giving when we
     * are attempting to connect or send messages.
     *
     * @param {Error} e The error.
     * @api private
     */

    WS.prototype.onError = function (e) {
      this.socket.onError(e);
    };

    /**
     * Returns the appropriate scheme for the URI generation.
     *
     * @api private
     */
    WS.prototype.scheme = function () {
      return this.socket.options.secure ? 'wss' : 'ws';
    };

    /**
     * Checks if the browser has support for native `WebSockets` and that
     * it's not the polyfill created for the FlashSocket transport.
     *
     * @return {Boolean}
     * @api public
     */

    WS.check = function () {
      return ('WebSocket' in window && !('__addTask' in WebSocket))
            || 'MozWebSocket' in window;
    };

    /**
     * Check if the `WebSocket` transport support cross domain communications.
     *
     * @returns {Boolean}
     * @api public
     */

    WS.xdomainCheck = function () {
      return true;
    };

    /**
     * Add the transport to your public io.transports array.
     *
     * @api private
     */

    io.transports.push('websocket');

  })(
      'undefined' != typeof io ? io.Transport : modules.exportss
    , 'undefined' != typeof io ? io : modules.parent.exportss
  );

  /**
   * socket.io
   * Copyright(c) 2011 LearnBoost <dev@learnboost.com>
   * MIT Licensed
   */

  (function (exportss, io, global) {

    /**
     * Expose constructor.
     *
     * @api public
     */
    
    exportss.XHR = XHR;

    /**
     * XHR constructor
     *
     * @costructor
     * @api public
     */

    function XHR (socket) {
      if (!socket) return;

      io.Transport.apply(this, arguments);
      this.sendBuffer = [];
    };

    /**
     * Inherits from Transport.
     */

    io.util.inherit(XHR, io.Transport);

    /**
     * Establish a connection
     *
     * @returns {Transport}
     * @api public
     */

    XHR.prototype.open = function () {
      this.socket.setBuffer(false);
      this.onOpen();
      this.get();

      // we need to make sure the request succeeds since we have no indication
      // whether the request opened or not until it succeeded.
      this.setCloseTimeout();

      return this;
    };

    /**
     * Check if we need to send data to the Socket.IO server, if we have data in our
     * buffer we encode it and forward it to the `post` method.
     *
     * @api private
     */

    XHR.prototype.payload = function (payload) {
      var msgs = [];

      for (var i = 0, l = payload.length; i < l; i++) {
        msgs.push(io.parser.encodePacket(payload[i]));
      }

      this.send(io.parser.encodePayload(msgs));
    };

    /**
     * Send data to the Socket.IO server.
     *
     * @param data The message
     * @returns {Transport}
     * @api public
     */

    XHR.prototype.send = function (data) {
      this.post(data);
      return this;
    };

    /**
     * Posts a encoded message to the Socket.IO server.
     *
     * @param {String} data A encoded message.
     * @api private
     */

    function empty () { };

    XHR.prototype.post = function (data) {
      var self = this;
      this.socket.setBuffer(true);

      function stateChange () {
        if (this.readyState == 4) {
          this.onreadystatechange = empty;
          self.posting = false;

          if (this.status == 200){
            self.socket.setBuffer(false);
          } else {
            self.onClose();
          }
        }
      }

      function onload () {
        this.onload = empty;
        self.socket.setBuffer(false);
      };

      this.sendXHR = this.request('POST');

      if (global.XDomainRequest && this.sendXHR instanceof XDomainRequest) {
        this.sendXHR.onload = this.sendXHR.onerror = onload;
      } else {
        this.sendXHR.onreadystatechange = stateChange;
      }

      this.sendXHR.send(data);
    };

    /**
     * Disconnects the established `XHR` connection.
     *
     * @returns {Transport} 
     * @api public
     */

    XHR.prototype.close = function () {
      this.onClose();
      return this;
    };

    /**
     * Generates a configured XHR request
     *
     * @param {String} url The url that needs to be requested.
     * @param {String} method The method the request should use.
     * @returns {XMLHttpRequest}
     * @api private
     */

    XHR.prototype.request = function (method) {
      var req = io.util.request(this.socket.isXDomain())
        , query = io.util.query(this.socket.options.query, 't=' + +new Date);

      req.open(method || 'GET', this.prepareUrl() + query, true);

      if (method == 'POST') {
        try {
          if (req.setRequestHeader) {
            req.setRequestHeader('Content-type', 'text/plain;charset=UTF-8');
          } else {
            // XDomainRequest
            req.contentType = 'text/plain';
          }
        } catch (e) {}
      }

      return req;
    };

    /**
     * Returns the scheme to use for the transport URLs.
     *
     * @api private
     */

    XHR.prototype.scheme = function () {
      return this.socket.options.secure ? 'https' : 'http';
    };

    /**
     * Check if the XHR transports are supported
     *
     * @param {Boolean} xdomain Check if we support cross domain requests.
     * @returns {Boolean}
     * @api public
     */

    XHR.check = function (socket, xdomain) {
      try {
        if (io.util.request(xdomain)) {
          return true;
        }
      } catch(e) {}

      return false;
    };

    /**
     * Check if the XHR transport supports corss domain requests.
     * 
     * @returns {Boolean}
     * @api public
     */

    XHR.xdomainCheck = function () {
      return XHR.check(null, true);
    };

  })(
      'undefined' != typeof io ? io.Transport : modules.exportss
    , 'undefined' != typeof io ? io : modules.parent.exportss
    , this
  );

  /**
   * socket.io
   * Copyright(c) 2011 LearnBoost <dev@learnboost.com>
   * MIT Licensed
   */

  (function (exportss, io) {

    /**
     * Expose constructor.
     */

    exportss.htmlfile = HTMLFile;

    /**
     * The HTMLFile transport creates a `forever iframe` based transport
     * for Internet Explorer. Regular forever iframe implementations will 
     * continuously trigger the browsers buzy indicators. If the forever iframe
     * is created inside a `htmlfile` these indicators will not be trigged.
     *
     * @constructor
     * @extends {io.Transport.XHR}
     * @api public
     */

    function HTMLFile (socket) {
      io.Transport.XHR.apply(this, arguments);
    };

    /**
     * Inherits from XHR transport.
     */

    io.util.inherit(HTMLFile, io.Transport.XHR);

    /**
     * Transport name
     *
     * @api public
     */

    HTMLFile.prototype.name = 'htmlfile';

    /**
     * Creates a new ActiveX `htmlfile` with a forever loading iframe
     * that can be used to listen to messages. Inside the generated
     * `htmlfile` a reference will be made to the HTMLFile transport.
     *
     * @api private
     */

    HTMLFile.prototype.get = function () {
      this.doc = new ActiveXObject('htmlfile');
      this.doc.open();
      this.doc.write('<html></html>');
      this.doc.close();
      this.doc.parentWindow.s = this;

      var iframeC = this.doc.createElement('div');
      iframeC.className = 'socketio';

      this.doc.body.appendChild(iframeC);
      this.iframe = this.doc.createElement('iframe');

      iframeC.appendChild(this.iframe);

      var self = this
        , query = io.util.query(this.socket.options.query, 't='+ +new Date);

      this.iframe.src = this.prepareUrl() + query;

      io.util.on(window, 'unload', function () {
        self.destroy();
      });
    };

    /**
     * The Socket.IO server will write script tags inside the forever
     * iframe, this function will be used as callback for the incoming
     * information.
     *
     * @param {String} data The message
     * @param {document} doc Reference to the context
     * @api private
     */

    HTMLFile.prototype._ = function (data, doc) {
      this.onData(data);
      try {
        var script = doc.getElementsByTagName('script')[0];
        script.parentNode.removeChild(script);
      } catch (e) { }
    };

    /**
     * Destroy the established connection, iframe and `htmlfile`.
     * And calls the `CollectGarbage` function of Internet Explorer
     * to release the memory.
     *
     * @api private
     */

    HTMLFile.prototype.destroy = function () {
      if (this.iframe){
        try {
          this.iframe.src = 'about:blank';
        } catch(e){}

        this.doc = null;
        this.iframe.parentNode.removeChild(this.iframe);
        this.iframe = null;

        CollectGarbage();
      }
    };

    /**
     * Disconnects the established connection.
     *
     * @returns {Transport} Chaining.
     * @api public
     */

    HTMLFile.prototype.close = function () {
      this.destroy();
      return io.Transport.XHR.prototype.close.call(this);
    };

    /**
     * Checks if the browser supports this transport. The browser
     * must have an `ActiveXObject` implementation.
     *
     * @return {Boolean}
     * @api public
     */

    HTMLFile.check = function () {
      if ('ActiveXObject' in window){
        try {
          var a = new ActiveXObject('htmlfile');
          return a && io.Transport.XHR.check();
        } catch(e){}
      }
      return false;
    };

    /**
     * Check if cross domain requests are supported.
     *
     * @returns {Boolean}
     * @api public
     */

    HTMLFile.xdomainCheck = function () {
      // we can probably do handling for sub-domains, we should
      // test that it's cross domain but a subdomain here
      return false;
    };

    /**
     * Add the transport to your public io.transports array.
     *
     * @api private
     */

    io.transports.push('htmlfile');

  })(
      'undefined' != typeof io ? io.Transport : modules.exportss
    , 'undefined' != typeof io ? io : modules.parent.exportss
  );

  /**
   * socket.io
   * Copyright(c) 2011 LearnBoost <dev@learnboost.com>
   * MIT Licensed
   */

  (function (exportss, io, global) {

    /**
     * Expose constructor.
     */

    exportss['xhr-polling'] = XHRPolling;

    /**
     * The XHR-polling transport uses long polling XHR requests to create a
     * "persistent" connection with the server.
     *
     * @constructor
     * @api public
     */

    function XHRPolling () {
      io.Transport.XHR.apply(this, arguments);
    };

    /**
     * Inherits from XHR transport.
     */

    io.util.inherit(XHRPolling, io.Transport.XHR);

    /**
     * Merge the properties from XHR transport
     */

    io.util.merge(XHRPolling, io.Transport.XHR);

    /**
     * Transport name
     *
     * @api public
     */

    XHRPolling.prototype.name = 'xhr-polling';

    /** 
     * Establish a connection, for iPhone and Android this will be done once the page
     * is loaded.
     *
     * @returns {Transport} Chaining.
     * @api public
     */

    XHRPolling.prototype.open = function () {
      var self = this;

      io.Transport.XHR.prototype.open.call(self);
      return false;
    };

    /**
     * Starts a XHR request to wait for incoming messages.
     *
     * @api private
     */

    function empty () {};

    XHRPolling.prototype.get = function () {
      if (!this.open) return;

      var self = this;

      function stateChange () {
        if (this.readyState == 4) {
          this.onreadystatechange = empty;

          if (this.status == 200) {
            self.onData(this.responseText);
            self.get();
          } else {
            self.onClose();
          }
        }
      };

      function onload () {
        this.onload = empty;
        self.onData(this.responseText);
        self.get();
      };

      this.xhr = this.request();

      if (global.XDomainRequest && this.xhr instanceof XDomainRequest) {
        this.xhr.onload = this.xhr.onerror = onload;
      } else {
        this.xhr.onreadystatechange = stateChange;
      }

      this.xhr.send(null);
    };

    /**
     * Handle the unclean close behavior.
     *
     * @api private
     */

    XHRPolling.prototype.onClose = function () {
      io.Transport.XHR.prototype.onClose.call(this);

      if (this.xhr) {
        this.xhr.onreadystatechange = this.xhr.onload = empty;
        try {
          this.xhr.abort();
        } catch(e){}
        this.xhr = null;
      }
    };

    /**
     * Webkit based browsers show a infinit spinner when you start a XHR request
     * before the browsers onload event is called so we need to defer opening of
     * the transport until the onload event is called. Wrapping the cb in our
     * defer method solve this.
     *
     * @param {Socket} socket The socket instance that needs a transport
     * @param {Function} fn The callback
     * @api private
     */

    XHRPolling.prototype.ready = function (socket, fn) {
      var self = this;

      io.util.defer(function () {
        fn.call(self);
      });
    };

    /**
     * Add the transport to your public io.transports array.
     *
     * @api private
     */

    io.transports.push('xhr-polling');

  })(
      'undefined' != typeof io ? io.Transport : modules.exportss
    , 'undefined' != typeof io ? io : modules.parent.exportss
    , this
  );

  /**
   * socket.io
   * Copyright(c) 2011 LearnBoost <dev@learnboost.com>
   * MIT Licensed
   */

  (function (exportss, io) {

    /**
     * Expose constructor.
     */

    exportss['jsonp-polling'] = JSONPPolling;

    /**
     * The JSONP transport creates an persistent connection by dynamically
     * inserting a script tag in the page. This script tag will receive the
     * information of the Socket.IO server. When new information is received
     * it creates a new script tag for the new data stream.
     *
     * @constructor
     * @extends {io.Transport.xhr-polling}
     * @api public
     */

    function JSONPPolling (socket) {
      io.Transport['xhr-polling'].apply(this, arguments);

      this.index = io.j.length;

      var self = this;

      io.j.push(function (msg) {
        self._(msg);
      });
    };

    /**
     * Inherits from XHR polling transport.
     */

    io.util.inherit(JSONPPolling, io.Transport['xhr-polling']);

    /**
     * Transport name
     *
     * @api public
     */

    JSONPPolling.prototype.name = 'jsonp-polling';

    /**
     * Posts a encoded message to the Socket.IO server using an iframe.
     * The iframe is used because script tags can create POST based requests.
     * The iframe is positioned outside of the view so the user does not
     * notice it's existence.
     *
     * @param {String} data A encoded message.
     * @api private
     */

    JSONPPolling.prototype.post = function (data) {
      var self = this
        , query = io.util.query(
               this.socket.options.query
            , 't='+ (+new Date) + '&i=' + this.index
          );

      if (!this.form) {
        var form = document.createElement('form')
          , area = document.createElement('textarea')
          , id = this.iframeId = 'socketio_iframe_' + this.index
          , iframe;

        form.className = 'socketio';
        form.style.position = 'absolute';
        form.style.top = '-1000px';
        form.style.left = '-1000px';
        form.target = id;
        form.method = 'POST';
        form.setAttribute('accept-charset', 'utf-8');
        area.name = 'd';
        form.appendChild(area);
        document.body.appendChild(form);

        this.form = form;
        this.area = area;
      }

      this.form.action = this.prepareUrl() + query;

      function complete () {
        initIframe();
        self.socket.setBuffer(false);
      };

      function initIframe () {
        if (self.iframe) {
          self.form.removeChild(self.iframe);
        }

        try {
          // ie6 dynamic iframes with target="" support (thanks Chris Lambacher)
          iframe = document.createElement('<iframe name="'+ self.iframeId +'">');
        } catch (e) {
          iframe = document.createElement('iframe');
          iframe.name = self.iframeId;
        }

        iframe.id = self.iframeId;

        self.form.appendChild(iframe);
        self.iframe = iframe;
      };

      initIframe();

      this.area.value = data;

      try {
        this.form.submit();
      } catch(e) {}

      if (this.iframe.attachEvent) {
        iframe.onreadystatechange = function () {
          if (self.iframe.readyState == 'complete') {
            complete();
          }
        };
      } else {
        this.iframe.onload = complete;
      }

      this.socket.setBuffer(true);
    };
    
    /**
     * Creates a new JSONP poll that can be used to listen
     * for messages from the Socket.IO server.
     *
     * @api private
     */

    JSONPPolling.prototype.get = function () {
      var self = this
        , script = document.createElement('script')
        , query = io.util.query(
               this.socket.options.query
            , 't='+ (+new Date) + '&i=' + this.index
          );

      if (this.script) {
        this.script.parentNode.removeChild(this.script);
        this.script = null;
      }

      script.async = true;
      script.src = this.prepareUrl() + query;
      script.onerror = function () {
        self.onClose();
      };

      var insertAt = document.getElementsByTagName('script')[0]
      insertAt.parentNode.insertBefore(script, insertAt);
      this.script = script;
    };

    /**
     * Callback function for the incoming message stream from the Socket.IO server.
     *
     * @param {String} data The message
     * @api private
     */

    JSONPPolling.prototype._ = function (msg) {
      this.onData(msg);
      if (this.open) {
        this.get();
      }
      return this;
    };

    /**
     * Checks if browser supports this transport.
     *
     * @return {Boolean}
     * @api public
     */

    JSONPPolling.check = function () {
      return true;
    };

    /**
     * Check if cross domain requests are supported
     *
     * @returns {Boolean}
     * @api public
     */

    JSONPPolling.xdomainCheck = function () {
      return true;
    };

    /**
     * Add the transport to your public io.transports array.
     *
     * @api private
     */

    io.transports.push('jsonp-polling');

  })(
      'undefined' != typeof io ? io.Transport : modules.exportss
    , 'undefined' != typeof io ? io : modules.parent.exportss
  );


  module.exports = io;

})
